[ Gerund vs Infinitive ]
In an ancient civilizations people used … danger with smoke
A. signal
B. to signal
Select your answer:

Random Topics:
Adverbs, Modals, Preposition of timeGrammar - First ConditionalGrammar - help/have/let/makeOffer and SuggestionAuxiliaries VerbPerfect Tenses of VerbsSimple vs Present Continuous TensesAdjectives (-ed / -ing)Transitional WordsGrammar - to beOther quiz:
Noun Phrases and Verb Phrases › ViewWhich is the finite verb phrase in “The doctors might have risked catching infectious diseases from the patients.”?
A. risked
B. have risked
C. might have risked
D. catching
E. might
Modals of Obligation and Necessity › View
Must and Have to express the same level of obligation.
A. TRUE
B. FALSE
